are there mooring balls available on Peter island?

Yes. Great Harbor has lots of FCFS mooring balls. Pay through the BVI Ball app. I believe they're $40/nt.

What happens if you don’t have internet?

Good question George. I guess if no one comes around to collect, it's free. We were there last May and I tried to pay thru the app, but the app required a ball number which I couldn't find. I entered some random number, which the app didn't accept. No one ever came to colect.

We used the app on our trip last July. It took me a while to realize the app contains a map of the mooring ball field along with your boat's location. As I recall once I zoomed out, found us and the ball, we had the necessary information to pay through the app.

I thought the balls said to pay at Oceans 7 which in July was only open a couple of days a week.